Nephew Satoru regularly visits his aunt Rei Aimi's house, where they always share warm, affectionate moments. One day, Satoru drops by to find her husband away, leaving them completely alone. As Rei cleans the bathroom, Satoru accidentally catches sight of her and becomes instantly aroused, unable to hide his excitement as he calls out to her. Surprised and flustered, Rei hesitates at first but soon finds herself unable to resist her growing desire. The shifting tension between them, charged with forbidden emotion and intimacy, unfolds in an intensely realistic and captivating way.